Machine for cutting screw-threads.



No. 733,446. PATENTED JULY 14, 1903. G. F. WIELAND.

MACHINE POR GUTTIN G SCREW THREADS.

APPLIOATION runp SEPT. zo. 19o2.

`N0 MODEL. l v 2 SHEETS-SHEET 1.

No. 733,446. PATENTEDJULY 14, 1903. G. F. WIELAND.

MACHINE FOR GUTTING SCREW THREADS.

No. veen-ie.

Nrrnn STATES Patented July 14, 1903.

ittica.

amanti v|\.fiAol-m\i|= FOR CUTTING SCREW-THREADS;

S'EECIFCATION forming part of Letters Patent No. 733,446, dated July 14, 1903.

Appnmidn tied september 20,1902. stanno. 124,145. (nommen To all whom it may concern:

Be it known that I, CHARLEs F. WIELAND, a citizen of the United States, and a resident of Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in Machines for CuttingY Screw-Threads; and I do hereby declare that theV following is a full, clear, and exact description thereof.

My invention relates to machines for cutting screw-threads upon metal bars or pipes, and is an improvement on the machine which forms the subject of Letters Patent of the United States, numbered 682,774, granted me on the 17th day of September, 1901, the said improvement consisting in certain peculiarities of construction and combination of parts, as will be fully set forth hereinafter in connection with the accompanying drawings and subsequently claimed.

In the said drawings, Figure 1 is a View in front elevation of so much of my said machine as is necessary to illustrate my present improvements, said view being partly in section on the plane indicated by the line A A in Fig. 2 looking inthe direction of the arrows marked 1 1. Fig. 2 is a vertical sectional view taken on the plane indicated by the line 2'2 in Fig. 1. Fig. 3 is a View in front elevation of the supporting-casting of my machine. Fig. et is a transverse sectional view of the same, taken on the plane indicated by the line 4; el in Figr. Fig. 5 is a vertical sectional View of the cam-ring and adjacent parts, also taken'on the plane indicated by the line A A inV Fig. 2, but looking in the direction of the arrows marked 5 5 in said Fig. 2, and also taken on the plane indicated by the line 5 5 in Fig. 7. Figs. 6 and 7are detail sectional Yviews of the cam-ring, taken, respectively, on the planes indicated by the lines 6 (j and 7 7 in Fig. 5, but omitting` the ilanged retaining-ring shown in said fifth gure.

Referring by numerals to the drawings, 1 represents the supporting-casting, having a preferably integral lateral extension 2, in which the radially-disposed movable chasers or cutting-tools are mounted and to which the rotatable cam-ring 3 is secured by means of the flanged retaining-ring l and screws 5 5. The cam-ring 3 has secured thereto by screws 6 6 a lug or bracket 7, and the casting 1 has rising therefrom a preferably integral portion 8, provided with a dovetail or other shaped groove for receiving and supporting a correspondinglyshaped slidable fulcrumblock 9 for the operating handle or lever 10, pivotally connected to said block, as shown at 1l, the adjacent end of said lever carrying another pivot 12, from which a link 13 extends to a pivot 14 on the described lug or bracket 7. In. the part 8 of the casting there is mounted a screw 15, which engages with a screw-threaded bore in the block 9, the edge of the guidewayin which said block is mounted being preferably provided with a scale, as shown in Fig. 1. By the manipulation of the screw 15 the block 9 is adjusted or moved longitudinally in either direction for the purpose of regulating the number of degrees the cam-ring 3 will move when the lever 10 is raised orlowered, and consequently regulatingthe radial thrust of the chasers, and by means of the described scale the operator may adjust the position of the block 9 in order to limit the inward movement of the chasers with exactness when the lever 10 is thrown. The part 8 is provided With a stop-pin 16 and the lever lO with an undercurved fin 17 for cooperation with the pin 16 in the various positions of adjustment of the lever-fulcrum, the operation and construction of all the hereinbefore-named parts of my present machine being substautially similar to those in the machine set forth in my prior patent hereinbefore named.

In my present machine provision is made to insure that the chasers or cutting-tools shall remain in place no matter in what position the cam-ring may be at any time, and hence by my present improvements l have overcome the liability of the said chasers to drop down or out when in line with the peripheralI openings of said. cam -ring, as has frequently happened with former devices of this same general nature wherein the chasers were all entered from either the outer periphery or from the central opening of the die-head, whereas in my present machine the upper series of chasers are introduced from the exterior of said cam-ring and the lower series from the interior, all as hereinafter more fully set forth.

IOO

Referring to Figs. 3 and 4, the stationary part V2 of the die-head (which, as stated, is preferably integral with the casting 1) is shown as formed with a series of annular steps or faces, (marked 18, 19, 20, and 21, respectively,) the last face having an annular groove 22 at its inner edge, and there being :i radially-disposed series of slots through .certain of said steps or faces extending inward to the line of the face 19, six of such slots being shown, the three upperones above the axial line ot' the die-head being marked 23 23 23 and the three slots below said line being marked 24 24 24, there being also a series of bores 25 25, preferably one adjacent to each of the said slots, for the reception of the screws 5 5 when the anged retainingring 4 is secured in place, the just-described slots being for the reception of the hereinbefore-named chasers,whose shape is best shown in Figs. 1 and 2, the upper series of chasers 26 26 26 being provided with laterally-pra,

jecting pins 27 adjacent to their ends farthestfrom their cutting-faces, and the lower series of chasers 28 28 28 being formed with transverse arc-shaped grooves 29 adjacent to their corresponding ends, for a purpose to be presently described.

The cam-ring 3 is formed with a series of peripheral openings, six being shown in the present drawings, three of said openings being marked 30 30 30 and the other three being designated 31 3l 31, each of the lastnamed openings being guarded by a lug 32, and the openings 30 each being increased centrally in depth by the outer end 33 of a groove having an inward tangential continuation 34, each of the latter bordering one of a series of cams 35 35 35 in the upper part of the die-head, there being corresponding cams 36 36 36 in the lower part of said die-head, and adjacent to each cam 36, but some little distance inward therefrom, is one of a series of tangentially-disposed arc-shaped ribs 37 37 37, each rib corresponding in curvature to that of the adjacent cam 36.

The operation of my machine will be readily understood from the foregoing description of its construction, taken in connection with the accompanying drawings, the said operation being in all essential particulars the same as in my prior patent hereinbefore named, except that in assembling the parts the upper series of chasers 26 26 26 are introduced toplace through the upper peripheral openings 30 30 30 of the cam-ring, with the pins 27 of said chasers inserted in the described grooves 33 34 and held by the inner walls of said grooves, while the lower series of chasers 2S 28 28 are introduced to place through the central opening of the die-head, the transverse grooves 29 of these last-named chasers fitting over and receiving the ribs 37, while the lugs 32 in the openings 31 prevent the said chasers 2S from dropping down and out when brought in line with said openings in the operation of the machine, the movereggae ment of the operating-lever, the slidable fulcrum-block, and the adjacent parts being precisely as stated in my said prior patent,and the butt-ends of the described chasers being operated by the cams of the cam-ring in the same manner as heretofore therein set forth.

In practice the lower chasers will first be introduced into the die-head, and it is highly desirable that all the slots in which the chasers move should be kept clean. This is readily accomplished through the described peripheral openings of the cam-ring, those in the lower part of the ring having sufficient space for this purpose on each side and in front of the lugs 32, which latter from their size and location are sufficient to keep said chasers from falling out, as stated, this cleaning being accomplished by means of bits of waste drawn through when the said openings 30 and 3l in the cam-ring are in line with the slots 23 and 24 in the stationary portion 2 of the die-head,whereby the said cleaning is accomplished without removing the cam-ring or separating any parts of the diehead, this being a great advantage.

In order to guard as much as possible against the entrance of dust, dirt, metal chips, and other foreign matter into the die-head, the described flanged retaining ring 4 is formed with an inwardly-extending annular ange made in sections (marked 38 3S) about its inner periphery, the spaces 39 between each two adjacent sections being to permit of the free passage of the chasers, and this sectional flange ts within the hereinbeforenamed annular groove 22 at the inner edge of the face 2l of the said stationary part 2 of the die-head.

I-Iaving thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a machine for cutting screw-threads, the combination with the stationary part of the die-head, of upper and lower series of IOO IIO

chasers or cutting-tools, and a rotatable cam A ring for moving said chasers into and out of operative position, the said cam-ring being provided with upper peripheral openings for permitting the introduction of the upper se-Y ries of chasers from its exterior above its axial line and lower peripheral openings for permitting the introduction of the lower series of chasers from the interior or central opening of the die-head, together with means for holding said chasers in place, and preventing any of them from dropping down and out in the rotation of said cam-ring.

2. In a machine for cutting screw-threads, the combination with the stationary part of the die-head, of upper and lower series of chasers or cutting-tools, and a rotatable camring for moving said chasers into and out of operative position, the said cam-ring having upper and lower series of peripheral openings, the upper series of said openings being centrally increased in depth to form grooves which continue tangentially on arc-shaped vea-14e lines bordering the upper series of cams, and the upper series of chasers being formed with pins adjacent to their butt-ends for engagement within said grooves, While the lower series of the said peripheral openingsv are guarded by lugs, the cam-ring being provided with series of arc-shaped ribs adjacent to the lower series of cams, and the lower series of chasers being formed with transverse aroshaped grooves adjacent to their butt-ends for engagement with said ribs.

3. In a machine for cutting screw-threads, the combination with the stationary part of the die-head, series of movable chasers or outting-tools,and rotatable camring,of a flanged retaining-ring and fastening-screws for holding the assembled parts together, the said stationary-part being formed with a series of annular steps or faces, the last face having an annular groove at its inner edge and there being a radially disposed series of slots through certain of said steps or faces, and

being formed in sections interrupted by.

spaces in line with the peripheral openings of said cam-ring. l

In testimony that I claim the foregoing I have hereunto set my hand, at Milwaukee, in the county of Milwakee and State of Wisconsin, in the presence of tWo Witnesses.

v CHARLES F. WIELAND. Witnesses:

H. G. UNDERWooD, BERNARD C. RoLoFF. 

